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Topic: Recent concerns on aftermarket exhaust systems

in Forum: C6 Fuel, Emission Control, and Exhaust Systems

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Recent concerns on aftermarket exhaust systems (2/12)
 3/23/08 6:16pm
cafranz1
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Prescott, AZ - USA

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60 with both tops 68 with t-tops


Joined: 5/20/2003
Posts: 151

Normal driving with headers still requires the oxygen sensor and the computer to work around 14.7 parts of air to 1 part of gasoline. When you stand on it the closed loop of info and computer switches to a look up table with about a 12:1 ratio. I can't see headers leaning that out enough to be of concern. On top of that I have read that retuning after headers is done to actually lean out the 12:1 a bit for even more power. I don't think there is reason for concern. |cheers|

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Curt Franz LeMans Blue Coupe born on Sept 15th, 2005
Recent concerns on aftermarket exhaust systems (3/12)
 3/27/08 2:54pm
vettesiv
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Joined: 3/2/2008
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My daughter has had a Borla system on her 94 25th Anniversary Trans Am (LT1 engine) with no ill effects. YMMV, but she's had no issues and it sure sounds great! |cool|
Recent concerns on aftermarket exhaust systems (4/12)
 3/29/08 9:50pm
jmarctex
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Joined: 10/27/2007
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I have a Borla system on my 06 C6. The only complaint I have is some resonance around 1600 rpm. The factory suggested inserting venturis into the pipes prior to the muffers. Borla supplied the venturis. Has anyone tried this and did it resolve the resonance?
Recent concerns on aftermarket exhaust systems (5/12)
 3/30/08 1:44pm
cafranz1
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Prescott, AZ - USA

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60 with both tops 68 with t-tops


Joined: 5/20/2003
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Venturis sound like restrictions to me. |headscratch|

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Curt Franz LeMans Blue Coupe born on Sept 15th, 2005
Recent concerns on aftermarket exhaust systems (6/12)
 4/5/08 11:44am
jmarctex
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Installing the venturis does imply adding some restriction to the exhaust system - I won't install them until I hear from someone who has tried it before me. |confusing|
Recent concerns on aftermarket exhaust systems (7/12)
 4/13/08 8:57am
doggone
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Which Borla's do you have on your c606? I have Stingers
and there is no resonnance just a fine sounding burble when you let off accelerator. Is it this 'burbbling' or more like buzzing you hear. If buzzing assume you have checked all the installation pieces on connection for correct torque and hangers locations.
Recent concerns on aftermarket exhaust systems (8/12)
 4/17/08 9:35pm
jmarctex
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It's not a buzzing but more of a low frequency drone when at 1600 rpm's, it goes away when the rpm's climb or drop from 1600. I plan to check the hangers when I get it up on a lift.
Re: Recent concerns on aftermarket exhaust systems (9/12)
 5/27/12 4:13pm
Stephen P
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Cedar Rapids, IA - USA

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1999 C5 Coupe 1SC Z51 2002 C5 Coupe 1SC Z51 C6 Convertible 3-12-07. Triple-Black Convertible. 3LT Z51 Paddle-shift Auto. 2013 Corvette Anniversary/Collectors Edition Convertible 4LT Six Speed purchased 10-6-2012


Joined: 3/13/2004
Posts: 33

Every vehicle leaving any assembly line has gone through a precise design process to maximize intended performance while meeting regulations for mileage and emission standards.  Of course new exhaust, Air Intake, wheel size, etc. are altering this balanced design configuration with after-market stuff.  
When adding a free-flow intake and open exhaust, the air/fuel ratio must be altered to provide the intended fuel energy for the sought-after performance/acceleration gains.  Fun is as designed; buy a performance car designed to get performance.  Buy an econo-box designed to take advantage of the compromise between performance in order to save money at the gas pump. 
The biggest BS put out on the street:  buy an electric vehicle to eliminate emission release.  There must be an exhaust pipe or exhaust stack at the electric power plant (unless it is Nuclear!) to supply your source of electricity.  Wind Generators cannot provide a base-load reliable continuous source of electricity.  The only regular constant wind source if the entity trying to bias your understanding.  Due to electrical distribution losses, the end result is greater pollutant releases likely over a motor vehicle DESIGN exhaust outlet!  There is more than one way to blow smoke up you environment.
Most modifications can be automatically adjusted for by the original installed sensors and designed PCM engine computer.  Aggressive alteration will require a retune specific to the changes that exceed the manufacturers design goals.  This "Master-of-the-Obvious" statement comes up against stoicometric design intent.  
Why the Hell is it that the most complained about "problem" with Hummers is gas mileage.  DUH!!!!  Heavy work, off-road capability, large vehicle mass requires more fuel energy to perform the "DESIGN" functions.  Not a surprise; just the facts.  Shut the front door!      


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Stephen P
Re: Recent concerns on aftermarket exhaust systems (10/12)
 5/27/12 4:17pm
Stephen P
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Cedar Rapids, IA - USA

Vette(s):
1999 C5 Coupe 1SC Z51 2002 C5 Coupe 1SC Z51 C6 Convertible 3-12-07. Triple-Black Convertible. 3LT Z51 Paddle-shift Auto. 2013 Corvette Anniversary/Collectors Edition Convertible 4LT Six Speed purchased 10-6-2012


Joined: 3/13/2004
Posts: 33

A venturi is designed to change a pressure-head to a velocity-head in order to maximize air flow for combustion.  Same amount of air but altered results.

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Stephen P
Re: Recent concerns on aftermarket exhaust systems (11/12)
 5/29/12 12:04pm
CRMGSCoupe
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Camp Hill, PA - USA

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2002 QuickSiver Convertible, 2007 LeMans Blue Coupe, 2010 Crystal Red Metallic Grand Sport Coupe (Heritage Edition). 6 Speed Manual


Joined: 4/7/2008
Posts: 46

Headers maybe...but just a cat-back exhaust should not cause any issues. Have used Corsa on my last 3 Corvettes (over 50,000 miles combined) with no deleterious effects.
Re: Recent concerns on aftermarket exhaust systems (12/12)
 11/12/13 2:04pm
sharpseadog
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Joined: 7/11/2013
Posts: 11

No worries.

I have Borla Type S system on my C6.  It has a very sweet mellow tone under load from about 1300 to 1700 RPM, but can barely be heard cruising down the road.  It sounds much more like a performance car.  It has not changed cruise mileage much, still getting 26 to 29 MPG.  There is no "Annoying Drone".  If anything, it is a bit too quiet, although it roars when I "really get on it".  Definitely glad I didn't go for the touring model.  If I had it to do over again, I might opt for the "Attack" model which is the loudest Borla system for C6's.

I went with an axle back system, as I am skeptical of any advantage to the cat back.  As far as concerns about adversely affecting engine longevity, I have zero concerns.  This is a very mild modification and frankly should have no more effect than the factory dual mode system.  Just a lot simpler, and I don't have to really "get on it" to enjoy the mellow tone.  Instead, I enjoy listening to all 440 ponies singing in a "symphony in 8 part harmony"


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